The Bad News: This event is so clearly awesome that all the tickets have been sold out!

The Good News: Grist is giving away two pairs of tickets to two lucky readers! (That is, if you are one of two winners, you can take a +1 to the show with you. Air/train/bike fare not included.)

The Catch: Tell us a joke! Seriously, tweet it with the tag #StandUpForGrist or post in the comments below, and we’ll pick the ones that make us snort the most milk. Bonus points if you manage to make light of impending climate doom, but no subject matter is off limits (though we’ve probably heard the one about the interrupting cow before, so try to show us something new). One entry per jokester, plz.

Even if we don’t select your joke, you’re still a winner in our eyes: Grist will also hold a Happy Hour Extravaganza (prizes! good times for all!) before the show, at the Bell House’s Frontier Room from 6 to 8 p.m. This extracurricular event is open to the public — no ticket required. Crowd in and get your Grist on!